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| Gray Herbarium | The library specializes in botanical history, floras of the new world, and Linnaeana and pre-Linnean sources. |
| Harvard University Herbaria | One of the world's largest collections of dried plants and fungal specimens is housed here. |
| The Herbarium of Smith College | A collection of nearly 60,000 plant specimens, many dating from the 1800's |
| The Marie Selby Botanical Gardens' Herbarium | Approximately 80,000 specimens largely collected in South and Central America, with lesser numbers from central Florida and the Old World Tropic |
| New York Botanical Garden Virtual Herbarium | Electronic gateway to the collections of the William and Lynda Steere Herbarium |
| S. M. Tracy Herbarium | Texas A&M University houses this collection of Texas plants, and samplings of plants from other parts of the world. The grass collection is a specialty. |
| United States National Herbarium | This Smithsonian Institution branch maintains a collection that is among the largest in the world. |
| University of Alaska Museum Herbarium | The only major research herbarium in Alaska with collection of more than 180,000 specimens. |
| University of Florida Herbarium | Vascular plants, bryophytes and lichens, wood, mycological, paleobotany collections and library |
| University of South Carolina Herbarium | Free, fast plant identifications provided by the University of South Carolina Herbarium. Identifications can be made from herbarium specimens, fresh material, or jpg images. ("Ask Plantman!") |